Combined photographic enlarging lantern and printing machine



M De 2, 1924. 1,517,742

J. c. MARTIN COMBINED PHOTOGRAPHIC ENLARGING LANTERN AND PRINTINGMACHINE Filed July 5, 1923 gwuemtoc I 3 I J a 447m),

v 61cm new Patented Dec. 2, 1924.

UNITED STATES PATENT OFFICE.

JOHN C. MARTIN, OF CAMERON, TEXAS.

COMBINE) PHOTOGRAPHIG ENLARGING LANTERN AND PRINTING MACHINE. A

Application filed July 5,

To all whom it may concern: Be it known that JOHN C. MARTIN, a citizenof the United States, residing at Cameron, in the county of Milam andState of Texas, has invented certain new and useful Improvements inCombined Photographic Enlarging Lanterns and Printing Machines, of whichthe following is a specification.

This invention has reference to combined photographic. enlarging lanternand printing machine and its object is to provide for an evenillumination of an image receiving light from electric lamps with thelight reflected upon curved surfaces located in the corners of theinstrument while provision is made for an equitable distribution oflight from electric lamps to the image to be copied. This isaccomplished by providing an enclosure housed by a box having curvedrear corners so that light from lamps pro-' duce a perfectly even lighton all parts of the negative for illuminating the same for use both asan enlarging lantern and as a printing machine.

In order to produce ample illumination with the light evenlydistributed, while cardboard or other such surface is used throughoutthe entire box, but other reflecting or refracting means is used insteadof the structures illuminated if so desired.

The advantages of the enlargin lantern and printing machine comprise ce'apness of construction, evenness of illumination and simplicity ofuse, the owner of the device requiring only the ownership of a camerathat has a removable back in order to make enlargements on it from fiveby seven negatives down to the smallest size and enlargements limitedonly by clearnem of the negative and the size of the available enlargingpaper.

Experience has taught that work can be done equally as well and muchmore clearly on the machine of the invention than with many complicatedmachines now selling for several times the cost of one made inaccordance-with the invention. There are no mechanical parts to becometroublesome or out of order. The device can be used as a erfect printingmachine as well as an enarger and moreover it is a rapid printer. Thoughsmall in size it may be employed to produce large copies.

The invention will be best understood from a consideration of thefollowing 1923. Serial No. 649,511

Figure 2 is a plan view of the structure shown in Figure 1;

Figure 3 is an elevation showing the interior of the box with the backremoved;

Figure 4 is a section on the line 4.-4 of Figure 1;

Figure 5 is a section on the line 55 of Figure l; and

Figure 6 is a left-hand view of the struc- 'ture shown in Figure 5.

7 to be retracted toward the central portion of the casing 1. Theelectric lamps 8 receive their energy through a conductor 9 connected toany suitable source of current.

The bottom 3 of the casing is connected to the front portion 4 by hinges10 so that this portion 4 may be swung about the hinges 10 to expose theinterior of the casing for access thereto.

Through the section 4 there is provided a passage 11 having borders 12through the passageway 13, arranged atthe front or top through whichlight is reflected to illuminate a negative.

Ordinarily in other enlarging lanterns either direct lighting and lampsplaced directly behind the negative with a mirror or other reflector isused or condensing lens placed in front of the light and directly behindthe negative employed. In this machine both the reflector and thecondensing lens are disposed with the light being entirely reflectedlight and on account of the construction of curved rear corners and theplacing of the lights give a perfectly even light on all parts of thenegatives.

" In the structure forming the subject of this invention whitecard-board or other suitable material is used for the enlarging lanternand the printing machine, such white cardboard or other suitable whitematerial is used on the under surface of the top 1 while on the undersurface of the box and the upright surface thereof as well as the fiatsurface on the back of the box, thus producing an indirect reflectedlighting both for enlarging and adapt the structure as a printingmachine. Of course, other refracting or reflecting substances,reflecting paints or surfacings may be used.

As a printing machine the structure is laid flat on the back and therinting frame 14 has a negative holder. en a negative is being copied itis held in the negative holder 14 at the bottom and secured by a button15 in position over the passageway 11. \Vhen the part to be copied islocated in the box 1 and the lights 6 are energized these lights arereflected against the curved surface 7 and from thence through thenegative or other part to be copied and out through the opening 11 to beimpressed upon a sensitive surface through the 0 ening 11 whether suchsensitive surface a sensitized plate or sensitized paper on which theenlargement is to be made.

What is claimed is:

A photograph enlarging lantern comprising a casing having continuousside and rear walls, the rear wall having an intermediate-plane surfacewhich extends from the upper to the lower edge of the said wall andwhich is disposed at a right angle to the inner surfaces of the sidewalls, the said rectangularly disposed surfaces being connected togetherby arcuate surfaces which extend from the upper to the lower edges ofthe rear and side walls, top and bottom walls'for the casing havinginner surfaces disposed in planes at right angles to the plane in whichthe intermediate surface of the rear wall lies, a. detachable wall forthe casing having an opening disposed opposite the plane surface of therear wall, and lamp bulbs located within the casing and having theirfilaments disposed approximately parallel with the curved surfaces whichmerge with the plane surfaces of the side and rear walls.

In testimony whereof I aflix my signature.

JOHN C. MARTIN.

